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Search Results: 1 - 10 of 348 matches for " Dib Gebara "
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TECNOLOGIA DE BAIXO CUSTO PARA CARACTERIZA O DE áREAS DESTINADAS à DISPOSI O DE RESíDUO SóLIDO URBANO EM PEQUENOS MUNICíPIOS
José Augusto de Lollo,Dib Gebara
Holos Environment , 2001,
Abstract: The technical, social and legal exigencies related with the selection of sites for urban waste solid disposal are very difficult, mainly for little towns administration in Brazil, due to the absence of financial and technical resources. Despite of the good legislation and technical recommendations existing in Brazil the prefectures don’t have the technical resources and enough people to do this work. These difficulties made urban administration selected sites without minimal technical considerations producing serious environmental risks. In this reality, technicians called to analyze these occupationproposal have some problems to define, land use criterion and technical solutions for this solid waste disposal works, without enough information. This paper describes how this problem occurs in two little towns in S o Paulo State – Brazil, the technical solutionsadopted for these land use situations, and the methodological proposal for these kind of studies. The proposal involves ground evaluation based on simple and low cost investigation techniques to provide the minimal information set for land evaluation. The two examples showed that the proposed technique is practicable and furnish the necessary information for correct construction techniques and dispose methods in these situations. = As exigências de ordem técnica, social e legal relacionadas à sele o de locais apropriados à disposi o de resíduo sólido urbano tem tornado a sele o destasáreas extremamente difícil especialmente em pequenos municípios brasileiros, uma vez que tais localidades n o disp em dos recursos apropriados para o bom desenvolvimentos desta atividade. Apesar da existência da legisla o e material informativo com recomenda es técnicas sobre o assunto as prefeituras brasileiras, especialmente empequenos municípios, n o possuem os recursos técnicos, financeiros e de pessoal necessários para executar este trabalho. Em fun o destas dificuldades é comum que a administra o urbana defina locais para disposi o de resíduos sólidos sem qualquer critério técnico criando condi es de sérios riscos ambientais. Em situa es como esta, ostécnicos chamados a analisar as propostas de ocupa o destas áreas têm a necessidade de definir, sem as informa es técnicas necessárias, critérios de uso e solu es tecnológicas para ocupa o destas áreas. O presente artigo descreve as características deste problema e sugere uma metodologia de avalia o de áreas destinadas a esta finalidade, acompanhada do estudo de caso de dois municípios. A proposta envolve avalia o das condi es do subsolo através de té
Transferência de oxigênio em reatores de leito fluidizado com circula??o em tubos concêntricos em meios bifásico e trifásico com varia??o da rela??o entre diametros
Araújo, Leandro Santos de;Dall'Aglio Sobrinho, Milton;Gebara, Dib;
Engenharia Sanitaria e Ambiental , 2010, DOI: 10.1590/S1413-41522010000300010
Abstract: the efficiency of the concentric tubes internal-loop airlift reactor depends on the hydrodynamic conditions that affect oxygen transfer to the biofilm. this work studied the effects of the relation between diameters of the tubes and of the carrier (sand) concentration on the global oxygen transfer coefficient (kla). the tests - in 2,6 m high reactors with 250 mm external diameter and 100, 125, 150 and 200 mm internal diameters - were performed with air flow taxes up to 2,500 l.h-1 and sand concentrations up to 150 g.l-1. the kla increased slightly for 30 g.l-1 and decreased for higher concentrations, in accordance with related data for similar conditions. a model for kla in biphasic medium was fitted embracing all the external/internal area relationships tested, based on the reduction of the liquid phase transfer coefficient and the bubble diameter ratio with increasing air flow rates.
SURVEY METHOD AND PROPOSAL FOR ALTERNATIVE MANAGEMENT OF COMMERCIAL WASTE = METODOLOGIA PARA LEVANTAMENTO E PROPOSI O DE ALTERNATIVAS DE GERENCIAMENTO DE RESíDUOS SóLIDOS COMERCIAIS
Ariel Cássio Marques Ernandes,Dib Gebara,José Augusto de Lollo
Holos Environment , 2008,
Abstract: Waste management techniques can result in significant reduction of environmental damage. However, the implementation of such techniques requires knowledge about management and its relationship with the community under consideration. Much has been written regarding methods and techniques for dealing with solid household wastes, but the same is not true of commercial wastes. This article proposes a systematic approach to collecting data on commercial solid waste management in Santa Fé do Sul - SP, with the aim of providing information to support proposals for management alternatives to reduce the amount of waste sent to the landfill. The process involves survey activities with commercial enterprises to identify kinds of waste produced by different commercial activities and, based on this knowledge, the proposition of management techniques for commercial waste. = O uso de medidas de gerenciamento de resíduos sólidos pode reduzir os significativos danos causados ou provocados ao meio ambiente. A implanta o de tais medidas pressup e o conhecimento da realidade existente com rela o a tal gerenciamento na comunidade que se está analisando. Quando se considera a situa o dos resíduos sólidos domiciliares, existe farta literatura descrevendo métodos e técnicas, o que n o ocorre em rela o aos resíduos comerciais. O presente trabalho teve por objetivo desenvolver uma sistemática para levantamento dos dados referentes aos resíduos sólidos comerciais em Santa Fé do Sul - SP, de forma a subsidiar a proposi o de alternativas de gerenciamento para se obter redu o na quantidade de resíduos encaminhados para disposi o final. O processo envolveu pesquisas junto aos estabelecimentos geradores afim de se definir os resíduos gerados por ramo de atividade comercial, criando condi es para a proposi o de alternativas de gerenciamento.
NITRIFICA O DE DIFERENTES SUBSTRATOS EM REATORES AERóBIOS DE LEITO FLUIDIZADO DE CIRCULA O INTERNA NITRIFICA O DE DIFERENTES SUBSTRATOS EM REATORES AERóBIOS DE LEITO FLUIDIZADO DE CIRCULA O INTERNA
Iván Andrés Sánchez Ortiz,Gleyce Teixeira Correia,Dib Gebara,Milton Dall'Aglio Sobrinho
Revista Ingenierías Universidad de Medellín , 2012,
Abstract: En esta investigación se estudió la eficiencia de remoción de nitrógeno total (NT) y nitrógeno amoniacal total (NAT) en aguas residuales de piscicultura intensiva y domésticas por medio de reactores aerobios de lecho fluidizado trifásicos con circulación en tubos concéntricos. Se utilizaron diferentes diámetros internos (100; 125 y 150mm) para un mismo diámetro externo de 250mm; se utilizó arena para filtros y carbón activado granular como medio soporte; los reactores se ensayaron con tiempos de retención hidráulica de 11.5 min para el reactor R100, y de tres horas para los R125 y R150. Las eficiencias medias de remoción del NT y del NAT fueron: en el R100 de 24% y 27%; en el R125 de 38% y 40%; y en el R150 de 30% y 49%, respectivamente. Cuanto mayor el diámetro interno mejor fue la eficiencia de remoción de NAT. This research was intended to study the efficiency of removing total nitrogen (TN) and total ammoniacal nitrogen (TAN) in waste water of intensive and domestic fish farming, through three-phase fluidized bed aerobic reactors with circulation in concentric tubes. Several internal diameters (100; 125; and 150 mm) were used for the same external diameter of 250 mm; filter sand and granular activated carbon were used as a support medium; reactors were tested with hydraulic retention times of 11.5 minutes for R100 reactor and three hours for R125 and R150 reactors. Mean removal efficiencies of TN and TAN were as follows: 24% for R100 Reactor; 38% and 40% for R125 Reactor; and 30% and 49% for R150 Reactor, respectively. The bigger the internal diameter the better the efficiency of TAN removal.
Reactores aerobios de lecho fluidizado trifásico con circulación interna: caracterización hidrodinámica y del soporte
Sánchez Ortiz,Iván Andrés; Teixeira Correia,Gleyce; Santos de Araújo,Leandro; Gebara,Dib; Dall'Aglio Sobrinho,Milton; Matsumoto,Tsunao;
Revista Facultad de Ingeniería Universidad de Antioquia , 2010,
Abstract: aerobic internal-loop reactors use active biomass attached in a supporting media (biofilm) with the advantage of retaining a big biomass concentration in a small physical space, removing carbonaceous matter and nitrogen in only one reactor. liquid circulation occurs due to hydrostatic pressure difference produced by air injection in the riser. in biphasic conditions liquid circulation velocities, gas holdup and oxygen transfer coefficient in four different reactor configurations were studied. for the three-phase conditions, the same parameters in just one of those configurations were evaluated. also, there were three granular supporting media characterized. on the other hand, the relationship between internal and external tube areas and supporting media concentrations influence the liquid velocity, gas holdup and oxygen mass transfer values and some important supporting media characteristics were observed and compared.
Fontes históricas e oralidade
Ademir Gebara
Movimento , 2004,
Abstract: El presente texto sistematiza las relaciones entre el historiador y sus fuentes, procurando elucidar cuestiones teóricas y metodológicas emergentes de la narrativa historica. Dos cuestiones conceptuales vertebran el texto. Una se refiere a la construcción de narrativas a partir de una fuente escrita tradicional, indicando las limitaciones de las posibilidades de conocimiento de culturas que no utilizan la lenguaje escrita. Una segunda cuestión emerge de la multiplicidad de tiempos del historiador, a partir de su interacción con las fuentes, la linearidad de la narrativa escrita también limita las posibilidades de conocimiento de grupos dominados. El texto finaliza apuntando para una cuestión central en el debate de historia oral, esto es, el historiador como productor de documentación histórica.
Diálogo com Aguirre Rojas sobre "Norbert Elias: historiador e crítico da modernidade"
Ademir Gebara
Diálogos , 2010, DOI: 10.4025/dialogos.v2i1.323
Abstract:
Convergências entre a teoria de Lev Semionovich Vigotski e de Norbert Elias
Honorato, Tony;Gebara, Ademir;
Estudos de Psicologia (Campinas) , 2012, DOI: 10.1590/S0103-166X2012000100014
Abstract: this study focuses on the problem of the individual's creation of singularity in society, taking as a reference lev s. vigotski's conception of internalization and norbert elias's conception of individualization. the objective is to identify convergences between the theory of vigotski and elias. to discuss the propositions of vigotski and elias, the methodology of theoretical exploratory research on the two authors was used. vigotski and elias made possible the understanding that singularities are processes and functions present in the formation of psychic and social structures.
-Bessel functions in two variables
Hacen Dib
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203112057
Abstract: The Bessel-Muirhead hypergeometric system (or 0F1-system) intwo variables (and three variables) is solved using symmetricseries, with an explicit formula for coefficients, in order toexpress the K-Bessel function as a linear combination of theJ-solutions. Limits of this method and suggestions forgeneralizations to a higher rank are discussed.
-Bessel functions associated to a 3-rank Jordan algebra
Hacen Dib
International Journal of Mathematics and Mathematical Sciences , 2005, DOI: 10.1155/ijmms.2005.2863
Abstract: Using the Bessel-Muirhead system, we can express the K-Bessel function defined on a Jordan algebra as a linear combination of the J-solutions. We determine explicitly the coefficients when the rank of this Jordan algebra is three after a reduction to the rank two. The main tools are some algebraic identities developed for this occasion.
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